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            <h2 class="toc-title">目录</h2>
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        </div><article class="page single"><h1 class="single-title animated flipInX">06_K8S_核心插件-ingress(服务暴露)控制器traefik</h1><div class="post-meta">
            <div class="post-meta-line"><span class="post-author"><a href="https://space.bilibili.com/394449264" title="Author" target="_blank" rel="noopener noreffer author" class="author"><i class="fas fa-user-circle fa-fw"></i>老男孩</a></span>&nbsp;<span class="post-category">收录于 <a href="/categories/%E8%BD%AC%E8%BD%BD/"><i class="far fa-folder fa-fw"></i>转载</a>&nbsp;<a href="/categories/k8s/"><i class="far fa-folder fa-fw"></i>K8S</a></span></div>
            <div class="post-meta-line"><i class="far fa-calendar-alt fa-fw"></i>&nbsp;<time datetime="2020-10-01">2020-10-01</time>&nbsp;<i class="fas fa-pencil-alt fa-fw"></i>&nbsp;约 1449 字&nbsp;
                <i class="far fa-clock fa-fw"></i>&nbsp;预计阅读 3 分钟&nbsp;<span id="/06_k8s_%E6%A0%B8%E5%BF%83%E6%8F%92%E4%BB%B6-ingress%E6%9C%8D%E5%8A%A1%E6%9A%B4%E9%9C%B2%E6%8E%A7%E5%88%B6%E5%99%A8traefik/" class="leancloud_visitors" data-flag-title="06_K8S_核心插件-ingress(服务暴露)控制器traefik">
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  <ul>
    <li><a href="#1-k8s两种服务暴露方法">1 K8S两种服务暴露方法</a>
      <ul>
        <li><a href="#11-k8s常用的两种服务暴露方法">1.1 K8S常用的两种服务暴露方法</a></li>
        <li><a href="#12-ingress控制器是什么">1.2 Ingress控制器是什么</a></li>
      </ul>
    </li>
    <li><a href="#2-部署traefik">2 部署traefik</a>
      <ul>
        <li><a href="#21-准备docker镜像">2.1 准备docker镜像</a></li>
        <li><a href="#22-创建资源清单">2.2 创建资源清单</a>
          <ul>
            <li><a href="#221-rbac授权清单">2.2.1 rbac授权清单</a></li>
            <li><a href="#222-delepoly资源清单">2.2.2 delepoly资源清单</a></li>
            <li><a href="#223-service清单">2.2.3 service清单</a></li>
            <li><a href="#224-ingress清单">2.2.4 ingress清单</a></li>
          </ul>
        </li>
        <li><a href="#23-创建资源">2.3 创建资源</a>
          <ul>
            <li><a href="#231-任意节点上创建资源">2.3.1 任意节点上创建资源</a></li>
            <li><a href="#232-在前端nginx上做反向代理">2.3.2 在前端nginx上做反向代理</a></li>
            <li><a href="#233-在bind9中添加域名解析">2.3.3 在bind9中添加域名解析</a></li>
            <li><a href="#234-在集群外访问验证">2.3.4 在集群外访问验证</a></li>
          </ul>
        </li>
      </ul>
    </li>
  </ul>
</nav></div>
            </div><div class="content" id="content"><h1 id="06_k8s_核心插件-ingress服务暴露控制器traefik">06_K8S_核心插件-ingress(服务暴露)控制器traefik</h1>
<h2 id="1-k8s两种服务暴露方法">1 K8S两种服务暴露方法</h2>
<p>前面通过coredns在k8s集群内部做了serviceNAME和serviceIP之间的自动映射,使得不需要记录service的IP地址,只需要通过serviceNAME就能访问POD
但是在K8S集群外部,显然是不能通过serviceNAME或serviceIP来解析服务的
要在K8S集群外部来访问集群内部的资源,需要用到服务暴露功能</p>
<h3 id="11-k8s常用的两种服务暴露方法">1.1 K8S常用的两种服务暴露方法</h3>
<ol>
<li>使用NodePort型的Service
nodeport型的service原理相当于端口映射，将容器内的端口映射到宿主机上的某个端口。
K8S集群不能使用ipvs的方式调度,必须使用iptables,且只支持rr模式</li>
<li>使用Ingress资源
Ingress是K8S API标准资源之一,也是核心资源
是一组基于域名和URL路径的规则,把用户的请求转发至指定的service资源
可以将集群外部的请求流量,转发至集群内部,从而实现'<strong>服务暴露</strong>'</li>
</ol>
<h3 id="12-ingress控制器是什么">1.2 Ingress控制器是什么</h3>
<p>可以理解为一个简化版本的nginx
Ingress控制器是能够为Ingress资源健康某套接字,然后根据ingress规则匹配机制路由调度流量的一个组件
只能工作在七层网络下，建议暴露http, https可以使用前端nginx来做证书方面的卸载
我们使用的ingress控制器为**<code>Traefik</code>**
traefik：<a href="https://github.com/containous/traefik" target="_blank" rel="noopener noreffer">GITHUB官方地址</a></p>
<h2 id="2-部署traefik">2 部署traefik</h2>
<p>同样的,现在<code>7.200</code>完成docker镜像拉取和配置清单创建,然后再到任意master节点执行配置清单</p>
<h3 id="21-准备docker镜像">2.1 准备docker镜像</h3>
<div class="highlight"><div class="chroma">
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">docker pull traefik:v1.7.2-alpine
docker tag  traefik:v1.7.2-alpine harbor.zq.com/public/traefik:v1.7.2
docker push harbor.zq.com/public/traefik:v1.7.2
</code></pre></td></tr></table>
</div>
</div><h3 id="22-创建资源清单">2.2 创建资源清单</h3>
<div class="highlight"><div class="chroma">
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">mkdir -p /data/k8s-yaml/traefik
</code></pre></td></tr></table>
</div>
</div><h4 id="221-rbac授权清单">2.2.1 rbac授权清单</h4>
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">cat &gt;/data/k8s-yaml/traefik/rbac.yaml &lt;&lt;EOF
apiVersion: v1
kind: ServiceAccount
metadata:
  name: traefik-ingress-controller
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: traefik-ingress-controller
rules:
  - apiGroups:
      - &#34;&#34;
    resources:
      - services
      - endpoints
      - secrets
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - extensions
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: traefik-ingress-controller
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: traefik-ingress-controller
subjects:
- kind: ServiceAccount
  name: traefik-ingress-controller
  namespace: kube-system
EOF
</code></pre></td></tr></table>
</div>
</div><h4 id="222-delepoly资源清单">2.2.2 delepoly资源清单</h4>
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">cat &gt;/data/k8s-yaml/traefik/ds.yaml &lt;&lt;EOF
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: traefik-ingress
  namespace: kube-system
  labels:
    k8s-app: traefik-ingress
spec:
  template:
    metadata:
      labels:
        k8s-app: traefik-ingress
        name: traefik-ingress
    spec:
      serviceAccountName: traefik-ingress-controller
      terminationGracePeriodSeconds: 60
      containers:
      - image: harbor.zq.com/public/traefik:v1.7.2
        name: traefik-ingress
        ports:
        - name: controller
          containerPort: 80
          hostPort: 81
        - name: admin-web
          containerPort: 8080
        securityContext:
          capabilities:
            drop:
            - ALL
            add:
            - NET_BIND_SERVICE
        args:
        - --api
        - --kubernetes
        - --logLevel=INFO
        - --insecureskipverify=true
        - --kubernetes.endpoint=https://10.4.7.10:7443
        - --accesslog
        - --accesslog.filepath=/var/log/traefik_access.log
        - --traefiklog
        - --traefiklog.filepath=/var/log/traefik.log
        - --metrics.prometheus
EOF
</code></pre></td></tr></table>
</div>
</div><h4 id="223-service清单">2.2.3 service清单</h4>
<div class="highlight"><div class="chroma">
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">cat &gt;/data/k8s-yaml/traefik/svc.yaml &lt;&lt;EOF
kind: Service
apiVersion: v1
metadata:
  name: traefik-ingress-service
  namespace: kube-system
spec:
  selector:
    k8s-app: traefik-ingress
  ports:
    - protocol: TCP
      port: 80
      name: controller
    - protocol: TCP
      port: 8080
      name: admin-web
EOF
</code></pre></td></tr></table>
</div>
</div><h4 id="224-ingress清单">2.2.4 ingress清单</h4>
<div class="highlight"><div class="chroma">
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">cat &gt;/data/k8s-yaml/traefik/ingress.yaml &lt;&lt;EOF
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: traefik-web-ui
  namespace: kube-system
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: traefik.zq.com
    http:
      paths:
      - path: /
        backend:
          serviceName: traefik-ingress-service
          servicePort: 8080
EOF
</code></pre></td></tr></table>
</div>
</div><h3 id="23-创建资源">2.3 创建资源</h3>
<h4 id="231-任意节点上创建资源">2.3.1 任意节点上创建资源</h4>
<div class="highlight"><div class="chroma">
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">kubectl create -f http://k8s-yaml.zq.com/traefik/rbac.yaml
kubectl create -f http://k8s-yaml.zq.com/traefik/ds.yaml
kubectl create -f http://k8s-yaml.zq.com/traefik/svc.yaml
kubectl create -f http://k8s-yaml.zq.com/traefik/ingress.yaml
</code></pre></td></tr></table>
</div>
</div><h4 id="232-在前端nginx上做反向代理">2.3.2 在前端nginx上做反向代理</h4>
<p>在<code>7.11</code>和<code>7.12</code>上,都做反向代理,将泛域名的解析都转发到<code>traefik</code>上去</p>
<div class="highlight"><div class="chroma">
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">cat &gt;/etc/nginx/conf.d/zq.com.conf &lt;&lt;&#39;EOF&#39;
upstream default_backend_traefik {
    server 10.4.7.21:81    max_fails=3 fail_timeout=10s;
    server 10.4.7.22:81    max_fails=3 fail_timeout=10s;
}
server {
    server_name *.zq.com;

    location / {
        proxy_pass http://default_backend_traefik;
        proxy_set_header Host       $http_host;
        proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
    }
}
EOF
# 重启nginx服务
nginx -t
nginx -s reload
</code></pre></td></tr></table>
</div>
</div><h4 id="233-在bind9中添加域名解析">2.3.3 在bind9中添加域名解析</h4>
<p>需要将traefik 服务的解析记录添加的DNS解析中,注意是绑定到VIP上</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">vi /var/named/zq.com.zone
........
traefik            A    10.4.7.10
</code></pre></td></tr></table>
</div>
</div><blockquote>
<p>注意前滚serial编号</p>
</blockquote>
<p>重启named服务</p>
<div class="highlight"><div class="chroma">
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<td class="lntd">
<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback">systemctl restart named
#dig验证解析结果
[root@hdss7-11 ~]# dig -t A traefik.zq.com +short
10.4.7.10
</code></pre></td></tr></table>
</div>
</div><h4 id="234-在集群外访问验证">2.3.4 在集群外访问验证</h4>
<p>在集群外,访问<code>[http://traefik.zq.com](http://traefik.zq.com)</code>,如果能正常显示web页面.说明我们已经暴露服务成功</p>
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